Angst, Manuel ORCID: 0000-0001-8892-7019, Adiga, Shilpa, Gorfman, Semen, Ziolkowski, Michael, Strempfer, Joerg, Grams, Christoph, Pietsch, Manuel and Hemberger, Joachim (2019). Intrinsic Ferroelectricity in Charge-Ordered Magnetite. Crystals, 9 (11). BASEL: MDPI. ISSN 2073-4352

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Abstract

Single crystalline magnetite Fe3O4 was investigated at low temperatures in the charge ordered state by electric measurements and time-resolved diffraction with voltage applied in-situ. Dielectric spectroscopy indicates relaxor ferroelectric characteristics, with polarization switching observably only at sufficiently low temperatures and in a suitably chosen time-window. PUND measurements with a ms time scale indicate a switchable polarization of about 0.6 mu C/cm(2). Significant switching occurs only above a threshold field of about 3 kV/mm, and it occurs with a time delay of about 20 mu s. The time-resolved diffraction experiment yields, for sufficiently high voltage pulses, a systematic variation by about 0.1% of the intensity of the (2, (2) over bar, (10) over bar) Bragg reflection, which is attributed to structural switching of domains of the non-centrosymmetric Cc structure to its inversion twins, providing proof of intrinsic ferroelectricity in charge ordered magnetite.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Angst, ManuelUNSPECIFIEDorcid.org/0000-0001-8892-7019UNSPECIFIED
Adiga, ShilpaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gorfman, SemenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ziolkowski, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Strempfer, JoergUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grams, ChristophUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pietsch, ManuelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hemberger, JoachimUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-128787
DOI: 10.3390/cryst9110546
Journal or Publication Title: Crystals
Volume: 9
Number: 11
Date: 2019
Publisher: MDPI
Place of Publication: BASEL
ISSN: 2073-4352
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
FE3O4; DIFFRACTION; TRANSITION; CONDUCTION; CRYSTALMultiple languages
Crystallography; Materials Science, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12878

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